E. F. Johnson Company Product. Inductor. Material: plastic, metal. Size: 6 1/4" W. x 8 7/8" L. x 6 7/8" D. Description: brown Bakelite and copper - type 4103HSM5 Inductor. Museum label black on silver on brown bakelite front plate: "4103HSM5 - 1940." Metal I.D. plate lower front plate: "E.F. Johnson Company, Waseca, Minnesota, U.S.A. Type 4103MH5, Serial 208."